[ Longitudinal Surveys ]

Knowledge Networks conducts both cross-sectional and longitudinal surveys for a broad spectrum of academics – economists, political scientists, psychologists, sociologists, health researchers, and others – who require high-quality survey data. Projects range from one-time surveys, to multiple waves with cross-sectional samples, to longitudinal surveys spanning several waves across a couple years. The samples may draw from the general population or from those meeting certain demographic requirements, health characteristics, or other unique criteria. Some researchers require a few hundred or several thousand interviews with a nationally representative sample (see, for example, the Annenberg National Health Communication Survey, at http://anhcs.asc.upenn.edu/), while others focus on particular geographic regions or even state-level populations (from states with larger populations). Researchers' designs often require additional features, such as random assignment of sample to different treatments; audio and/or video integrated into surveys; measurement of item response time at the millisecond level; or full coverage of U.S. Spanish language survey takers. Academics may supplement their surveys via KN's qualitative research capabilities, including online focus groups or town hall meetings; video questions and answers; moderated probing; and in-depth telephone interviews.